Total Synthesis of the Proposed Structure of Aldingenin B
作者:Michael T. Crimmins、Colin O. Hughes
DOI:10.1021/ol3007259
日期:2012.4.20
The first enantioselective total synthesis of the proposed structure of aldingenin B is reported in 16 steps from known compounds. The stereochemistry at C5 and C6 were established by an asymmetricacetalaldol. Following a ring-closing metathesis, a selective, substrate-controlled hydrogen bond-mediated dihydroxylation provided control of the C2 and C3 stereocenters. Discrepancies in the spectroscopic
作者:Stephen T. Heller、James N. Newton、Tingting Fu、Richmond Sarpong
DOI:10.1002/anie.201502894
日期:2015.8.17
synthesis of unsymmetricalketones utilizing a pyrrole‐bearing carbonyl linchpin reagent (carbonyl linchpin N,O‐dimethylhydroxylamine pyrrole; CLAmP) is reported. In contrast to other carbonyl dielectrophile equivalents, CLAmP enables the synthesis of ketones from a variety of organolithium and Grignard reagents. The electrophilic nature of CLAmP enables the addition of less reactive as well as thermally
Synthesis of the C-1−C-28 ABCD Unit of Spongistatin 1
作者:Matthew J. Gaunt、Alan S. Jessiman、Paolo Orsini、Huw R. Tanner、David F. Hook、Steven V. Ley
DOI:10.1021/ol035849+
日期:2003.12.1
[GRAPHICS]The synthesis of the C-1-C-28 ABCD fragment of spongistatin is described. Anti-selective boron-mediated aldol coupling of a CD spiroketal ketone fragment to an AB spiroketal aldehyde unit forms the desired C1-C28 advanced intermediate. Other features include the double conjugate addition of a dithiol to an ynone to generate the key beta-keto-dithiane unit required for the synthesis of the AB spiroketal fragment.