Carbamoylstannation of Terminal Alkynes with Carbamoylstannanes: Catalyst-Dependent Regiochemical Reversal
摘要:
Rh(acac)(CO)(2) catalyzes addition of (N,N-diisopropylcarbamoyl)trimethylstannane to terminal alkynes to give (Z)-beta-stannyl-alpha,beta-unsaturated amides with terminal attachment of the amide group, while the use of Ni(COd)(2) results in the reversal of the regioselectivity. A mechanism initiated by the oxidative addition of the carbamoylstannane was proposed on the basis of the isolation of (trimethylstannyl)(N,N-diisopropylcarbamoyl)[1,2-bis(dimethylphosphtno)ethane]pallidium.
Treatment of acid chlorides with a carbamoylstannane under mild conditions (mostly rt for a few hours) affords α-oxo amides in high yields. Vicinal polycarbonyl compounds are also obtained, although spontaneous decarbonylation occasionally occurs.
LINDSAY, CHARLES M.;WIDDOWSON, DAVID A., J. CHEM. SOC. PERKIN TRANS.,(1988) N 3, 569-573
作者:LINDSAY, CHARLES M.、WIDDOWSON, DAVID A.
DOI:——
日期:——
Carbamoylstannation of Terminal Alkynes with Carbamoylstannanes: Catalyst-Dependent Regiochemical Reversal
作者:Ruimao Hua、Shun-ya Onozawa、Masato Tanaka
DOI:10.1021/om000423+
日期:2000.8.1
Rh(acac)(CO)(2) catalyzes addition of (N,N-diisopropylcarbamoyl)trimethylstannane to terminal alkynes to give (Z)-beta-stannyl-alpha,beta-unsaturated amides with terminal attachment of the amide group, while the use of Ni(COd)(2) results in the reversal of the regioselectivity. A mechanism initiated by the oxidative addition of the carbamoylstannane was proposed on the basis of the isolation of (trimethylstannyl)(N,N-diisopropylcarbamoyl)[1,2-bis(dimethylphosphtno)ethane]pallidium.
Lindsay, Charles M.; Widdowson, David A., Journal of the Chemical Society. Perkin transactions I, 1988, p. 569 - 574