[reaction: see text] Nine examples are reported of enantioselective [4 + 2] cycloaddition reactions of achiral, acyclic substrates to form chiral bicyclo[4.3.0]nonane or bicyclo[4.4.0]decane derivatives.
[反应:见正文]报告了九个非手性,无环底物对映体选择性[4 + 2]环加成反应,形成手性双环[4.3.0]
壬烷或双环[4.4.0]
癸烷衍
生物的实例。