Li, Guigen; Chang, Han-Ting; Sharpless, K. Barry, Angewandte Chemie, 1996, vol. 108, # 4, p. 449 - 452
作者:Li, Guigen、Chang, Han-Ting、Sharpless, K. Barry
DOI:——
日期:——
Catalytic Asymmetric Aminohydroxylation Provides a Short Taxol Side-chain Synthesis.
作者:Guigen Li、K. Barry Sharpless、Carl E. Olsen、Birgitte R. Rassing、Jo Klaveness、Frode Rise、Kjell Undheim、Connie N. Rosendahl、Monika Haugg、Nathalie Trabesinger-Rüf、Elmar G. Weinhold
DOI:10.3891/acta.chem.scand.50-0649
日期:——
The p-toluenesulfonamide derivative of the C-13 side-chain of taxol was prepared on a one third mole scale in a single step from methyl cinnamate. The process employed is catalytic asymmetric aminohydroxylation (catalytic AA). In the present case, there is no work-up other than filtration of the pure product which is insoluble in the reaction mixture. The sulfonamide protecting group is removed by acidic hydrolysis.
A New Approach to Osmium-Catalyzed Asymmetric Dihydroxylation and Aminohydroxylation of Olefins
作者:Malin A. Andersson、Robert Epple、Valery V. Fokin、K. Barry Sharpless
Neighbouring group assisted sulfonamide cleavage of Sharpless aminols under acetonation conditions
作者:S. Chandrasekhar、Suchismita Mohapatra
DOI:10.1016/s0040-4039(97)10638-4
日期:1998.2
It is accidentally observed that N-Ts cleavage and simultaneous protection of resulting free amino group as acetonide with the adjacent hydroxygroup is achieved in one pot. Neighbouring carboxylic estergroup is essential for this transformation.