DIELS-ALDER REACTIONS OF 2-ALKENYLBORANES AND CIS-1-ALKENYLBORANES - ANOMALOUS SELECTIVITY THAT ALLOWS A CHOICE OF REGIOCHEMISTRY
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abstract
2-Alkenyl- and cis-1-alkenylboranes are highly reactive Diels-Alder dienophiles which display unusual selectivity patters. By taking advantage of a reversal of regiochemistry of reaction with alkenyldihalo- versus alkenyldialkylboranes, any desired regioisomeric product may be favored, usually with very high selectivity. 1993.