Abstract 9-Azabicyclo[4.2.1]nonane skeleton was formed in one step by Lewis acid promoted reaction between 1-methoxycarbony1-2,5-dimethoxypyrrolidine and 1-ethoxy-1-trimethylsiloxy-1,4-pentadiene, and it was converted to (±)-anatoxin a.
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Shono et al. (1987) studied this question.
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