Diastereocontrol of thio-Claisen rearrangement induced by an adjacent hydroxy-substituted chiral centre
作者:Pierre Beslin、St�phane Perrio
DOI:10.1039/c39890000414
日期:——
S-Allyl α-hydroxy ketene dithioacetals smoothly rearrange into α-allyl β-hydroxydithioesters with a high level of syn-diastereoselectivity, with the syn : anti ratio ranging from 24:1 to 6:1, independently of the geometry of the ketene double bond.
BESLIN, PIERRE;PERRIO, STEPHANE, J. CHEM. SOC. CHEM. COMMUN.,(1989) N, C. 414-416
作者:BESLIN, PIERRE、PERRIO, STEPHANE
DOI:——
日期:——
Formation stéréocontroˆlée de deux centres chiraux contigus par thio-rearrangement de claisen d'α-hydroxydithioacétals de cétène s-allylés.
作者:Pieire Beslin、Stéphane Perrio
DOI:10.1016/s0040-4020(01)86559-5
日期:1991.8
assignments were confirmed by a syn selective aldol reaction of 4-pentenedithioates with the appropriate aldehydes. A few 13C NMR generalization rules allowing syn and anti configuration determination were also put forth. A transition state model is proposed to explain the observed asymmetricinduction by the external hydroxy group as a result of both steric and stereoelectronic control.