Organometallics in organic synthesis. Applications of a new diorganozinc reaction to the synthesis of C-glycosyl compounds with evidence for an oxonium-ion mechanism
作者:Alan P. Kozikowski、Toshiro Konoke、Allen Ritter
DOI:10.1016/s0008-6215(00)90882-6
日期:1987.12
features of a new organozinc-based substitution process [heteroatom-C-(R1,R2)-SPh + R3(2)Zn----heteroatom-C-(R1,R2,R3)], first discovered during a total synthesis of the alkaloid mycotoxin alpha-cyclopiazonic acid, are described. Phenyl thioglycosides were valuable substrates in studying the nature of this reaction process. Since these sulfur compounds are converted into C-glycosylcompounds with some
Thiophenyl glycosides are converted to C-glycosides by reaction with allyl or methallyltri-n-butylstannane using both “one-electron” and “two-electron” procedures, which give different stereoselectivities in some cases.