Reactions of Vinyl Sulfoxides with Magnesium Amides. One-Pot Synthesis of Symmetrical and Unsymmetrical β-(Dialkylamino) Dithioacetals
作者:Masataka Kawakita、Kouichi Yokota、Hideki Akamatsu、Susumu Irisawa、Osamu Morikawa、Hisatoshi Konishi、Kazuhiro Kobayashi
DOI:10.1021/jo970741r
日期:1997.11.1
Vinyl sulfoxides (PhSOCR1=CHR2: R-1 = H, Me, or Ph; R-2 = H Or Me) were treated with (dialkylamino)magnesium reagents, generated in situ from the reaction of EtMgBr with secondary amines ((RRNH)-R-3-N-4: R-3 = Et, i-Pr, or Bn; R-4 = Me, Et, or i-Pr) in refluxing Et2O for 1 h, and stirring at room-temperature overnight gave the corresponding symmetrical beta-(dialkylamino) dithioacetals [(PhS)(2)(CRCHRNRR4)-C-1-N-2-R-3] in 24-84% yields. When the (diethylamino)magnesium reagent was treated with appropriate thiols (RSH; R = p-ClC6H4 or Bn) prior to the interaction with phenyl vinyl sulfoxide, the corresponding unsymmetrical beta-(diethylamino) dithioacetals [(PhS)(RS)CHCH2NEt2] were produced in 63-67% yields.