Zobrazeno 1 - 10
of 309
pro vyhledávání: '"DESAI, UR"'
Publikováno v:
IndraStra Global.
An alpha-alkoxy substituent provides acceleration and greater diastereoselectivity in organometallic additions to chiral ketones. We find that alpha-hydroxy substitution also plays a similar role. Whereas the addition of a Reformatsky reagent to unsu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::0f81d015354bf53e8204ddbb53f65872
Publikováno v:
IndraStra Global.
The acid-catalyzed hydrolytic cleavage of the 5,6-epoxyspirostane derivatives by the cation exchange resin Dowel 50W X8 has been exploited with the goal of developing synthetic protocols toward 3,4,5,6-polyhydroxyspirostane analogs that can serve as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::4cac509b5e0942c1dbb75f135918fbb2
http://hdl.handle.net/10054/5205
http://hdl.handle.net/10054/5205
Publikováno v:
IndraStra Global.
The conformational preference of A and B rings in four differently functionalized bromosubstituted 4-en-3-one steroids is studied by concerted application of high-resolution one- and two-dimensional nuclear magnetic resonance (NMR) techniques, such a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::0d1e2f7f9463b03a6b50e0c142948454
http://hdl.handle.net/10054/5204
http://hdl.handle.net/10054/5204
Autor:
DESAI, UR, TRIVEDI, GK
Publikováno v:
IndraStra Global.
The synthesis of title compound (1) by a series of functional group transformations in a high overall yield from the commercially available diosgenin is described. The synthesis requires 5-alpha, 6-beta-bromohydrin formation, radical-initiated ring f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::e27920ad8fb6dac350d337b4500ec5b6
http://hdl.handle.net/10054/5460
http://hdl.handle.net/10054/5460
Autor:
DESAI, UR, TRIVEDI, GK
Publikováno v:
IndraStra Global.
The C-13 NMR spectra of 2-substituted 4-en-3-one steroids have been studied. The functional groups include 2-alpha- and 2-beta-substituted 3-thia-butanoate or 4-thia-pentanoate moieties. The analysis mainly reflects on the gamma-interactions of gauch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::be41e6b0de22c728a7f4059d49b077a3
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5498
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5498
Publikováno v:
IndraStra Global.
The difficulties encountered in the protection of 3-alpha-hydroxy group of lithocholic acid 1 with three different types of protective groups are described. Only benzyl ether derivative was found to be suitable for synthetic transformations. The meth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::1b4f0992a1ab721ddb68abf0e5fde61f
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9998
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9998
Publikováno v:
IndraStra Global.
The allylic acetoxylation of (25R)-spirost-5-en-22-alpha-O-3-beta-yl-acetate (1) using bromine/silver acetate/pyridine/-60-degrees has been studied. Besides the expected 4-actoxy derivative 2 (72%), two products in minor amounts, viz. 5-beta, 6-alpha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::d128e69c611e1e399741a0961f4140f1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5475
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5475
Publikováno v:
IndraStra Global.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=issn23813652::0023736ec9c9ae5876fb499d192799d2
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9988
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9988
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