Synthesis and elaboration of functionalised carbohydrate-derived spiroketals
作者:Peter A. V. van Hooft、Farid El Oualid、Herman S. Overkleeft、Gijsbert A. van der Marel、Jacques H. van Boom、Michiel A. Leeuwenburgh
DOI:10.1039/b401699h
日期:——
three-step approach for the synthesis of sugar derived spiroketals is presented. The methodology consists of Grignardaddition of vinyl- or allylmagnesium bromide to a carbohydrate lactone, followed by K-10 clay mediated glycosidation with a terminal alkenol and subsequent ring-closing metathesis of the resulting diene. The generality of this procedure is demonstrated by the synthesis of various pyranose-
A novel and flexible synthesis of pyranose spiroacetal derivatives
作者:Peter A.V. van Hooft、Michiel A. Leeuwenburgh、Herman S. Overkleeft、Gijsbert A. van der Marel、Constant A.A. van Boeckel、Jacques H. van Boom
DOI:10.1016/s0040-4039(98)01247-7
日期:1998.8
A three-step approach to chiral pyranose [5,4], [5,5], [5,6] and [5,7] unsaturated spiroacetal derivatives from perbenzylated glucopyranolactone 1 is presented. The strategy involves Grignard addition of vinyl or allyl magnesium bromide to 1 to give 2 and 12, respectively, K-10 mediated glucosidation of different terminal alkenols with 2 and 12 followed by ring-closing metathesis. (C) 1998 Elsevier Science Ltd. All rights reserved.