SYN-ANTI ISOMERISM IN THE REACTIONS OF CIS-3,4-DISUBSTITUTED CYCLOBUTENES .6. CIS-DIHYDROXYLATION WITH OSO4

被引:16
作者
BURDISSO, M
GANDOLFI, R
RASTELLI, A
机构
[1] UNIV PAVIA,DIPARTMENTO CHIM ORGAN,V TARAMELLI 10,I-27100 PAVIA,ITALY
[2] UNIV MODENA,DIPARTMENTO CHIM,I-41100 MODENA,ITALY
关键词
D O I
10.1016/S0040-4039(00)78812-5
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The reaction of 1 with OsO4 (carried out in acetone:water=2:1) takes place with moderate to high syn selectivity for X = Cl, OAc, OSO2Me, contrary to the predictions of Kishi's empirical rule but in accordance with the direction of the ground state out-of-plane bending of the olefinic hydrogens of cyclobutenes. Moreover, face selectivity observed is solvent dependent: a decrease in the syn:anti ratio was observed upon replacing methanol for water.
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页码:2659 / 2662
页数:4
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