Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Gordon L. Lange"'
Autor:
Michael G. Organ, Gordon L. Lange
Publikováno v:
Synlett. 31:665-667
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::27fc823819ed3b24150c22f6cea37610
https://doi.org/10.1055/s-0036-1589465
https://doi.org/10.1055/s-0036-1589465
Publikováno v:
Tetrahedron: Asymmetry. 13:1355-1362
Three chiral 2,5-cyclohexadienone synthons bearing different chiral auxiliaries were examined in [2+2] photoadditions with cyclopentene. Regeneration of the ‘masked’ double bond in the adducts resulted in the preparation of optically active 5-4-6
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::40d4fb00f07e12ede0c80b264d010d13
https://doi.org/10.1016/s0957-4166(02)00339-7
https://doi.org/10.1016/s0957-4166(02)00339-7
Autor:
Alexandru Merica, Gordon L. Lange
Publikováno v:
Tetrahedron Letters. 40:7897-7900
A radical fragmentation/cyclization sequence of a [2+2] photoadduct derivative leads to the formation of the aromadendrane ring system. The 5,7 fused rings of this sesquiterpenoid family are formed in the fragmentation step and the cyclopropane moiet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee5366118eecb284dd58618183f8f49e
https://doi.org/10.1016/s0040-4039(99)01647-0
https://doi.org/10.1016/s0040-4039(99)01647-0
Autor:
Nijsiri Ruangrungsi, Arunporn Itharat, Gordon L. Lange, Kanokkan Intarit, Chaweewan Jansakul, Thatree Phadungcharoen, Alexandru Merica
Publikováno v:
Pharmaceutical Biology. 37:42-45
Ursolic acid (1), pseudoginsenoside-RP 1 (2), and pseudoginsenoside-RT 1 (3) were isolated from the fruit of Randia siamensis. 13 C NMR spectroscopy was particularly useful in confirming the structures of these components. Studies with rats showed th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4942f25414b4a08db6918130824698dc
https://doi.org/10.1076/phbi.37.1.42.6325
https://doi.org/10.1076/phbi.37.1.42.6325
Autor:
Gordon L. Lange, Nadia Corelli
Publikováno v:
Tetrahedron Letters. 48:1963-1965
A radical reaction of a tetracyclic iodide results in a tandem cyclobutylcarbinyl/cyclopropylcarbinyl fragmentation sequence to generate the framework of the sesquiterpenoid lactarane family.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5daec5be4a3ce3b7dc6d22f2565cd008
https://doi.org/10.1016/j.tetlet.2007.01.068
https://doi.org/10.1016/j.tetlet.2007.01.068
Publikováno v:
Tetrahedron Letters. 39:5489-5492
A highly regio- and stereoselective synthesis of the sesquiterpenoid trichodiene is reported. The approach requires only nine steps starting with a [2+2] photoaddition and employs the free radical fragmentation of an “external” cyclobutane bond i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d95b2f29ae57cf3d6ef9e985e4a461d5
https://doi.org/10.1016/s0040-4039(98)01140-x
https://doi.org/10.1016/s0040-4039(98)01140-x
Autor:
Gordon L. Lange, Alexandru Merica
Publikováno v:
Tetrahedron Letters. 39:3639-3642
Preparation of highly functionalized 16 constitutes one of the first attempts at the synthesis of the A/B carbon skeleton of the 11(15→1)-abeotaxanes. Further transformations of labile 16 give enedione 17 , an important relay compound in the synthe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d348173a09749d293a137d2e58dc06d0
https://doi.org/10.1016/s0040-4039(98)00637-6
https://doi.org/10.1016/s0040-4039(98)00637-6
Publikováno v:
Tetrahedron Letters. 38:6371-6374
The trinor-guaiane sesquiterpenoid (±)-dictammol 2 was synthesized, in only 6 steps, from photoadduct 5. The crucial step involved a SmI2-mediated tandem free radical fragmentation/elimination reaction of diiodide 10. Support for the recently revise
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0904d13534e41ebd2cd9117f26ee3ed2
https://doi.org/10.1016/s0040-4039(97)01466-4
https://doi.org/10.1016/s0040-4039(97)01466-4
Autor:
Christine Gottardo, Gordon L. Lange
Publikováno v:
Magnetic Resonance in Chemistry. 34:660-666
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd6e9f1a4da8de7392fb227274ac39f6
https://doi.org/10.1002/(sici)1097-458x(199609)34:9<660::aid-omr929>3.0.co
https://doi.org/10.1002/(sici)1097-458x(199609)34:9<660::aid-omr929>3.0.co
Autor:
Michael G. Organ, Gordon L. Lange
Publikováno v:
The Journal of Organic Chemistry. 61:5358-5361
The [2 + 2] photoaddition of 2-cyclopentenones with derivatives of the cyclic β-keto ester 1 was investigated. The resultant adducts then underwent fragmentation to 5/8 fused ring systems present in terpenoid natural products such as asteriscanolide
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c4636b1e93f43704a102dcc088f6a1b3
https://doi.org/10.1021/jo960088s
https://doi.org/10.1021/jo960088s