Dihydroquinidine acetate promoted osmylation of acetals of E-α,β- unsaturated aldehydes occurs with up to 40:1 stereoselection to afford the corresponding protected -α,β -dihydroxy aldehydes.
Ketene Claisen rearrangement of camphor-derived 1,3-oxathianes: complete control of tertiary and quaternary stereogenic centresElectronic supplementary information (ESI) available: experimental data. See http://www.rsc.org/suppdata/cc/b2/b206857e/
作者:Varinder K. Aggarwal、Alessandra Lattanzi、Daniel Fuentes
DOI:10.1039/b206857e
日期:2002.10.18
Dichloroketene reacts, via a [3,3]-sigmatropic rearrangement, with camphor-derived 1,3-oxathianes of α,β-unsaturated aldehydes to give macrocyclic thiolactones in high yield and with complete transfer of chirality. The rearrangement is stereospecific.