Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Polniaszek Richard P"'
Autor:
Pandit, Chennagiri R.1 (AUTHOR), Polniaszek, Richard P.1 (AUTHOR), Thottathil, John K.1 (AUTHOR)
Publikováno v:
Synthetic Communications. 2002, Vol. 32 Issue 15, p2427-2432. 6p. 2 Charts.
Publikováno v:
Synthetic Communications. 32:2427-2432
A simple and economical method for 2-substituted oxazole synthesis and its scope are described.
Publikováno v:
Tetrahedron Letters. 42:1827-1830
Cleavage of several 2,4-dimethoxybenzylmaleimides could be performed employing TFA in anisole. Electronic effects exemplified by varying the substitution present on the maleimide resulted in a variation in the rate of the deprotection. In contrast, 2
Autor:
Ping Chen, Joel C. Barrish, Robert Zahler, Peter T. W. Cheng, Polniaszek Richard P, Wang Xuebao, John K. Thottathil, Steven H. Spergel
Publikováno v:
Tetrahedron Letters. 38:3175-3178
A practical method for the preparation of α-N-BOC-epoxides from protected amino acid esters based on the Kowalski homologation reaction is described. This procedure can be readily performed on a large scale without the use of hazardous reagents and
Publikováno v:
Tetrahedron Letters. 37:575-578
Nucleophilic addition of chiral enolates 1 and ent- 1 with chiral iminium ion 2a occur with total stereochemical control.
Autor:
John K. Thottathil, Polniaszek Richard P, Truc Chi Vu, Michael K. Wong, Wen-Sen Li, Kishta Katipally, John E. Thornton, Zhenrong Guo
Publikováno v:
Tetrahedron Letters. 43:1923-1925
Reduction of 2,6-diacetoxy-2′-bromoacetophenone ( 10 ) with NaBH 4 led to 3,4-diacetoxydihydrobenzofuran ( 12 ) in a process involving acyl migration followed by cyclization. Subsequent hydrogenolysis gave 4-acetoxydihydrobenzofuran which, upon sap
Publikováno v:
Tetrahedron Letters. 42:1843-1845
The selective monoamidation of diesters and amidation of esters mediated by Lewis acids are described. The selective amidations of dimethyl pyridine-2,5-dicarboxylate ( 1) and dimethyl 2,3-indole-dicarboxylate ( 4) with primary and secondary amines m
Autor:
Jianji Wang, Miguel Rosingana, Polniaszek Richard P, Robert P. Discordia, Nachimuthu Soundararajan
Publikováno v:
Synlett. 2001:1485-1487
Publikováno v:
ChemInform. 27
Nucleophilic addition of chiral enolates 1 and ent- 1 with chiral iminium ion 2a occur with total stereochemical control.
Autor:
Ping Chen, Robert Zahler, Xuebao Wang, Polniaszek Richard P, Peter T. W. Cheng, S. H. Spergel, John K. Thottathil, Joel C. Barrish
Publikováno v:
ChemInform. 28