The first total synthesis of the opened-type Kopsia alkaloid grandilodine B is reported. Four stereocenters of this alkaloid, three of them quaternary, are stereoselectively generated by a Diels-Alder reaction, a diastereoselective cyanation of tertiary alcohol, and a facial-selective nitrone 1,3-dipolar cycloaddition.
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Wang et al. (2017) studied this question.
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