Enantioselective conversion of meso-cyclic disulfides to chiral cyclic sulfides via desulfurization with chiral aminophosphines
作者:Yoshihiro Miyake、Hiroya Takada、Kouichi Ohe、Sakae Uemura
DOI:10.1039/b000191k
日期:——
Enantioselective desymmetrization of meso-cyclic disulfides has been investigated on the basis of the desulfurization with chiral phosphines. Chiral tert-aminophosphines enable the desulfurization of a six-membered disulfide, cis-3,6-bis(alkoxycarbonyl)-1,2-dithiane 2, to give an enantiomerically enriched five-membered sulfide, trans-2,5-bis(alkoxycarbonyl)thiolane 5, with up to 36% ee. The desulfurization of a seven-membered disulfide, cis-3,7-bis(alkoxycarbonyl)-1,2-dithiepane 3, with chiral aminophosphines also gives a six-membered sulfide, trans-2,6-bis(alkoxycarbonyl)thiane 6, with up to 30% ee.
在手性膦脱硫的基础上,研究了内消旋环二硫化物的对映选择性去对称化。手性叔氨基膦能够将六元二硫化物 cis-3,6-bis(alkoxycarbonyl)-1,2-dithiane 2 脱硫,得到对映体富集的五元硫化物 trans-2,5-bis(烷氧基羰基)硫杂环戊烷 5,ee 高达 36%。七元二硫化物顺式-3,7-双(烷氧基羰基)-1,2-二硫杂环己烷3与手性氨基膦脱硫也得到六元硫醚反式-2,6-双(烷氧基羰基)硫烷6 ,ee 高达 30%。