Polarized ketene dithioacetals. 28. A new general highly stereoselective and regiospecific method for homologation of ketones to .alpha.,.beta.-unsaturated esters via .alpha.-oxoketene dithioacetals
A new general synthesis of 3- and 3,4-substituted 4a–q, 3,4-annelated 7a–d and condensed tricyclic 9a–e thiophenes has been developed through Simmons-Smith reaction on the respective α-oxoketene dithioacetals. Extension of the reaction to α-cinnamoylketene dithioacetals 10a–e and its higher enyl analogs 13a–d, 15a–c gave the corresponding 3-styryl 11a–e and 3-di- and trienyl 14a–d, 16a–c thiophenes
Partial Reductive Demethylthiolation of<i>a</i>-Ketoketene<i>S,S</i>-Acetals with Sodium Borohydride/Nickel Chloride: A New, General Method for 2-Methylthio-1-alkenyl Ketones
作者:B. Myrboh、L. W. Singh、H. Ila、H. Junjappa
DOI:10.1055/s-1982-29791
日期:——
MARINO J. P.; KOSTUSYK J. L., TETRAHEDRON LETT., 1979, NO 27, 2493-2496