Structure Investigations of (ent)-Cladospolide D by De Novo Synthesis and Kinetic and Thermodynamic Isomerization
作者:John Penn、George O’Doherty、Yalan Xing
DOI:10.1055/s-0029-1217606
日期:2009.9
dihydroxylation of a dienoate installed the remaining stereochemistry. The de novo asymmetric route allowed for the asymmetric synthesis of three members of the cladospolide natural products and correctly established the structure for cladospolide D. cladospolides B-D - asymmetric synthesis - natural product synthesis - E/Z-alkene isomerization
De Novo Asymmetric Synthesis of Cladospolide B−D: Structural Reassignment of Cladospolide D via the Synthesis of its Enantiomer
作者:Yalan Xing、George A. O’Doherty
DOI:10.1021/ol9000119
日期:2009.3.5
The enantioselectivesynthesis of cladospolide B, C, and (ent)-cladospolide D has been achieved in 11−15 steps from 1-nonyne. The route relies upon an alkyne zipper reaction to relay an ynone and dienoate functional groups across a nine carbon fragment, which enables a highly enantioselective Noyori ynone reduction and a diastereo- and regioselective Sharpless dihydroxylation of a dienoate. In addition
An efficient total synthesis of (+)-Cladospolide C
作者:Ch. Raji Reddy、N. Narsimha Rao
DOI:10.1016/j.tetlet.2009.03.036
日期:2009.5
The asymmetric synthesis of (+)-Cladospolide C has been achieved in 11 steps with 26% overall yield. Key steps in the sequence involve KAPA-promoted alkyne Zipper reaction, TPP-promoted enyne ester (ynoate) to diene ester (dienoate) isomerization, Sharpless asymmetric dihydroxylation and Yamaguchi macrolactonization.