Dynamic Thiol Exchange with β-Sulfido-α,β-Unsaturated Carbonyl Compounds and Dithianes
摘要:
A reversible covalent bond exchange of thiols, beta-sulfido-alpha,beta-unsaturated carbonyls, and dithianes has been studied in DMSO and D2P/DMSO mixtures. The equilibrium between thiols and beta-sulfido-alpha,beta-unsaturated carbonyls is obtained within a few hours, while the equilibration starting with the beta-dithiane carbonyls and thiols requires a few days. This time scale makes the system ideal for utilization in dynamic combinatorial chemistry.
PROCESS FOR PRODUCING OPTICALLY ACTIVE TRANS-VINYL SULFIDE ALCOHOLS
申请人:SUNTORY LIMITED
公开号:EP0801057A1
公开(公告)日:1997-10-15
A method for producing an optically active trans-vinylsulfide alcohol having the formula:
wherein R1 represents an alkyl group or an aryl group, comprising the step of reducing a trans-vinylsulfide ketone with a borane reducing agent in the presence of an optically active oxazaborolidine and an additive.
of in situ generated arynes with vinyl sulfides provides benzannulated sulfonium ylides in a (3+2) cycloaddition. Trapping of the intermediate ylides with electrophiles (proton transfer or a second aryne addition) and subsequent β‐elimination give rise to di‐, tri‐, or tetrasubstituted alkenes with high stereoselectivity. Experimental studies and DFT calculations provide insight into the mechanisms of
Dynamic Thiol Exchange with β-Sulfido-α,β-Unsaturated Carbonyl Compounds and Dithianes
作者:Gururaj Joshi、Eric V. Anslyn
DOI:10.1021/ol301781u
日期:2012.9.21
A reversible covalent bond exchange of thiols, beta-sulfido-alpha,beta-unsaturated carbonyls, and dithianes has been studied in DMSO and D2P/DMSO mixtures. The equilibrium between thiols and beta-sulfido-alpha,beta-unsaturated carbonyls is obtained within a few hours, while the equilibration starting with the beta-dithiane carbonyls and thiols requires a few days. This time scale makes the system ideal for utilization in dynamic combinatorial chemistry.