Effective 1,5-Asymmetric Induction in Tin(IV) Chloride Promoted Reactions Between Aldehydes and (4-Alkoxy-2-alkenyl)tributylstannanes
作者:Alan H. Mcneill、Eric J. Thomas
DOI:10.1055/s-1994-25469
日期:——
Transmetallation of (S)-4-benzyloxy-2-pentenyl(tributyl)stannane (1) using tin(IV) chloride generates an allyltin trichloride which reacts in situ with aldehydes to give 1-substituted syn-(3Z)-5-benzyloxyhexenols with excellent stereoselectivity. With chiral aldehydes, the stereoselectivity of the reaction is dominated by the reagent, except for 2-alkoxyaldehydes which show matching and mismatching consistent with preferred Felkin-Anh diastereofacial selectivity.
1,5-Asymmetric induction in reactions of δ-alkoxyallylstannanes: stereoselective reactions with chiral aldehydes
作者:Alan H. McNeill、Eric J. Thomas
DOI:10.1016/s0040-4039(00)91625-3
日期:1992.3
Transmetallation of (4S,2E)-4-phenylmethoxypent-2-enyl(tributyl)stannane 1 using tin(IV)chloride generates a reagent which shows excellent 1,5-stereoselectivity in reactions with aldehydes: with chiral aldehydes, the stereochemical preference of the reagent dominates the course of the reaction.
Bryostatins: The Asymmetric Synthesis of the C<sub>1</sub>-C<sub>9</sub>and C<sub>17</sub>-C<sub>27</sub>Fragments
作者:Jef De Brabander、Maurits Vandewalle
DOI:10.1055/s-1994-25589
日期:——
The construction of the fragments C1-C9 3 and C17-C27, 4a of the bryostatins in a enantioselective and highly diastereoselective fashion is described. The usefulness of the "chiron" approach is illustrated with the synthesis of these fragments from, respectively, D-pantolactone (6) and D-isobutyl lactate (23) as chiral templates.