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(R)- and (S)-2-Allyl-1,3,2-dinaphtho(α,β)dioxaborepin ((R)-2 and (S)-2) have been first prepared by the reaction of (R)-(+)- or (S)-(-)-1,1′-bi-2-naphthol and triallylborane in THF at room temperature, respectively. (S)-2 and (R)-2 are sensitive to moisture and oxygen in air and disproportionate easily to triallylborane and 1,1′-bi-2-naphthyl bis(1,1′-bi-2-naphtholborate) at ambient temperature. However, THF is a stabilizer for them. The reactions of (R)-2 or (S)-2 and some aliphetic or aromatic aldehydes in CH_ 2 Cl_ 2 at -78℃ for several hours afforded β-alkylenyl alcohols in up to 84.8% ee. Among them, optically active 1|(3,5-dichlorophenyl)-3-butenol and 1-(2-methoxyphenyl)-3-butenol were first prepared
(R) -2 and (S) -2-Allyl-1,3,2-dinaphtho (α, β) dioxaborepin ((R) -2 and (S) -2) have been first prepared by the reaction of () - or (S) - (-) - 1,1’-bi-2-naphthol and triallylborane in THF at room temperature, respectively. moisture and oxygen in air and disproportionate to triallylborane and 1,1’-bi-2-naphthyl bis (1,1’-bi-2-naphtholborate) at ambient temperature. However, THF is a stabilizer for them. (R) -2 or (S) -2 and some aliphetic or aromatic aldehydes in CH 2 Cl 2 at -78 ° C for several hours afforded β-alkylenyl alcohols in up to 84.8% ee. Among them, optically active 1 | (3,5-dichlorophenyl) -3-butenol and 1- (2-methoxyphenyl) -3-butenol were first prepared