An observation of diastereoface selectivity in thermal reactions between δ-alkoxyallylstannanes and aldehydes
作者:Simon V Mortlock、Eric J Thomas
DOI:10.1016/s0040-4039(00)87912-5
日期:1988.1
The δ-alkoxyallylstannanes (4) and (5) react stereoselectively on heating with -nitrobenzaldehyde to provide the homoallylic alcohols (14) - (17), with (14): (15) = 82: 18; (16): (17) = 73: 27.
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 betweenδ-alkoxyallylstannanes and aldehydes induced by tin (IV) chloride
作者:Alan H. McNeill、Eric J. Thomas
DOI:10.1016/s0040-4039(00)97034-5
日期:1990.1
Treatment of (S)-4-benzyloxypent-(2E)-2-enyl(tributyl)stannane (3) with tin (IV) chloride at −78 °C, followed by the addition of an aldehyde, gives 1,5-diol derivatives (6) with excellent 1,5-diastereoselectivity.
Remote asymmetric induction in reactions between 4- and 5-benzyloxypent-2-enyl(tributyl)stannanes and chiral imines prepared from butyl glyoxylate
作者:David J. Hallett、Eric J. Thomas
DOI:10.1039/c39950000657
日期:——
Transmetallation of 4- and 5-benzyloxypent-2-enyl(tributyl)stannanes 13 and 18 with tin(IV) chloride generates intermediate allyltin trichlorides which react with imines 9 and ent-9, prepared from butyl glyoxylate and either (R)- or (S)-1-phenylethylamine, with effective 1,5-asymmetric induction.
On the stereoselectivity of reactions of alkoxyallylstannanes and alkoxy aldehydes
作者:Pedro Almendros、Eric J. Thomas
DOI:10.1039/a702257c
日期:——
Different behaviour is observed in tin(IV)
halide promoted
reactions between the 2-(1-alkoxyethyl)prop-2-enylstannane 10 and the
4-alkoxypent-2-enylstannanes 1 with 2-alkoxy aldehydes. The chirality of
the aldehyde would appear to dominate the stereoselectivity in the
former case with the preferred addition following the chelation
controlled mode, whereas the stannane dominates the stereoselectivity in
the latter. The different behaviour of these two types of stannane may
be a reflection of the coordination of the tin in the intermediate
allyltin trihalides which are believed to be the reactive species
involved in the reactions with the aldehydes.