Nitrile Anion Cyclization with Epoxysilanes Followed by Brook Rearrangement/Ring Opening of Cyclopropane Nitriles/Alkylation
作者:Seigo Okugawa、Kei Takeda
DOI:10.1021/ol048817a
日期:2004.8.1
delta-unsaturated pentanenitrile derivatives via a tandem process that involves the formation of the cyclopropane derivative by epoxy nitrile cyclization followed by Brookrearrangement and an anion-induced cleavage of the cyclopropane ring.
Tandem epoxysilane rearrangement/Wittig-type reactions using γ-phosphinoyl- and γ-phosphonio-α,β-epoxysilane
作者:Michiko Sasaki、Mai Horai、Kei Takeda
DOI:10.1016/j.tetlet.2006.10.121
日期:2006.12
γ-phosphonio-α,β-epoxysilane with a base followed by addition of a ketone or an aldehyde afforded dienol silyl ether derivatives via a tandem process that involves base-induced ringopening of the epoxide, Brookrearrangement, and Wittig-type reaction.
New N-alkyl, alkenyl and benzyl substituted DNJ derivatives incorporating a silicon atom in the substituent were synthesised. Kinetic parameters (K-i, t(1/2)) for inhibition of rat intestinal alpha-glucohydrolases as well as human lysosomal alpha-glucosidases were measured. New DNJ derivatives are potent and selective inhibitors of intestinal alpha-glucohydrolases. (C) 1997, Elsevier Science Ltd.