Ansa compounds are gifts from microbes with intriguing molecular structures and highly potent bioactivities. One of the ansa compounds, kendomycin, has an oxa-metacyclophane skeleton with a quinone methide core and a fully substituted tetrahydropyran ring. Beyond a common synthetic strategy for construction of the ansa skeleton (i.e., elongation of an alkyl chain from an aromatic core followed by macrocyclization)
Stereochemical elucidation of the 1,4 polyketide amphidinoketide I
作者:Louise M Walsh、Jonathan M Goodman
DOI:10.1039/b309104j
日期:——
The relative and absolute stereochemistry of amphidinoketide I has been determined by the total synthesis of all the diastereoisomers. Molecular modelling suggests that the natural product is not the thermodynamically preferred diastereoisomer.
A Unified Total Synthesis of the Immunomodulators (−)-Rapamycin and (−)-27-Demethoxyrapamycin: Construction of the C(21−42) Perimeters
作者:Amos B. Smith、Stephen M. Condon、John A. McCauley、Johnnie L. Leazer、James W. Leahy、Robert E. Maleczka
DOI:10.1021/ja963066w
日期:1997.2.1
A totalsynthesis of the potent, naturally occurring immunomodulators (−)-rapamycin (1) and (−)-27-demethoxyrapamycin (2) has been achieved via a unified, highly convergent synthetic strategy. Both targets were elaborated from common building blocks A−E, the latter available in decagram quantities. Herein we present the construction of the ABC northern perimeters of 1 and 2. The accompanying paper
An Effective Bifunctional Aldehyde Linchpin for Type II Anion Relay Chemistry: Development and Application to the Synthesis of a C16–C29 Fragment of Rhizopodin
作者:Bruno Melillo、Ming Z. Chen、Roberto Forestieri、Amos B. Smith
DOI:10.1021/acs.orglett.5b03235
日期:2015.12.18
The design, synthesis, and validation of a new bifunctional aldehyde linchpin for Type II anionrelaychemistry have been achieved. For this linchpin, the initial nucleophilic addition proceeds under Felkin–Anh control to generate the syn-alkoxide, which undergoes a 1,4-Brook rearrangement to relay the negative charge, thus leading to the formation of a dithiane-stabilized carbanion. Subsequent trapping
A Stereoselective Formal Synthesis of Leucascandrolide A
作者:Kiyoun Lee、Hyoungsu Kim、Jiyong Hong
DOI:10.1021/ol200824r
日期:2011.5.20
A stereoselective formal synthesis of leucascandrolide A was accomplished through the tandem and organocatalytic oxa-Michael reactions, which were promoted by the gem-disubstituent effect, in conjunction with the dithiane coupling reaction.