KUNDIG, E. PETER;CUNNINGHAM, ALLAN F. (JR), TETRAHEDRON, 44,(1988) N 22, C. 6855-6860
作者:KUNDIG, E. PETER、CUNNINGHAM, ALLAN F. (JR)
DOI:——
日期:——
1,3-Benzodithiole tetraoxide as a CH22- synthon
作者:E.Peter Kündig、Allan F. Cunningham
DOI:10.1016/s0040-4020(01)86213-x
日期:1988.1
1,3-Benzodithiole tetraoxide (BDT) 4 is more reactive in alkylation reactions than the commonly used bis(benzenesulfonyl)methane (1). This is demonstrated notably in dialkylations with sterically demanding alkyl halides. Besides its ready access and larger scope of applications, BDT has two other advantages over 1, a lower molecular weight and higher crystallinity of its alkylated derivatives. As in
Asymmetric hydroformylation of 1,2-dialkyl olefins was reported. In order to increase the enantiomeric induction, steric auxiliary sulfonyl groups were introduced. Using a Rh/Yanphos complex as catalyst, chiral aldehydes were obtained with high enantioselectivities under mild pressure. The easily removable auxiliary made this method a powerful tool in the preparation of important enantiopure building