Synthesis of Thiol Esters Using PhSZnBr as Sulfenylating Agent: A DFT-Guided Optimization of Reaction Conditions
作者:Luca Sancineto、Caterina Tidei、Luana Bagnoli、Francesca Marini、Vito Lippolis、Massimiliano Arca、Eder João Lenardão、Claudio Santi
DOI:10.1002/ejoc.201600366
日期:2016.6
The use of PhSZnBr as sulfenylating agent in a solvent-free protocol to prepare thiolesters in excellent yields from acyl chlorides is reported. The products were efficiently obtained by grinding the neat reagents for 5 min in a mortar. DFT calculations showed that the coordination of solvent molecules to the metal center of PhSZnBr results in the destabilization of the frontier MOs, thus reducing
An expedient synthetic approach has been developed for the unified total synthesis of (+)-chinensiolide B and (+)-8-epigrosheimin. The point of divergence was provided by the lactone aldehyde 6, in which four contiguous stereocenters were achieved by stereocontrolled Evans syn-aldol reaction of R-carvone derived enantiopure aldehyde and chiral N-succinyl-oxazolidinone. The lactone aldehyde 6 was synthesized
已经开发了一种方便的合成方法,用于统一合成(+)-chinensiolide B和(+)-8-epigrosheimin。分歧点是由内酯醛6提供的,其中通过R-香芹酮衍生的对映纯醛和手性N-琥珀酰-恶唑烷酮的立体控制Evans syn-aldol反应获得了四个连续的立体中心。分三步以数克的量合成内酯醛6。高度优化的化学和立体选择反应以及官能团的相互转化使我们能够从6位组装(+)-chinensiolide B amd(+)-8-epigrosheimin。