Stereodivergent Synthesis of 1,3-syn- and -anti-Tetrahydropyrimidinones

[摘要]：An efficient protocol for the stereoselective synthesis of 1,3-syn and -anti-tetrahydropyrimidinones (syn- and anti-11a) is reported The modular procedure is based on a stereodivergent cyclization of readily available urea-type substrates (10a) by intramolecular allylic substitution The cyclization proceeds with excellent yield (up to 99%) and selectivity (up to dr > 20:1), purely based on substrate control The product pyrimidines can be readily transformed into the corresponding free syn- and anti-amines

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