Gs. Kauffman et al., An efficient chiral moderator prepared from inexpensive (+)3-carene: Synthesis of the HIV-1 non-nucleoside reverse transcriptase inhibitor DPC 963, ORG LETT, 2(20), 2000, pp. 3119-3121
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The beta-amino alcohol 4 beta-morpholinocaran-3 alpha-ol is prepared by add
ition of morpholine to alpha-3,4-epoxycarane utilizing anhydrous magnesium
bromide as Lewis acid promoter. The enantiopure amino alcohol is uniquely e
ffective as a chiral moderator for the addition of lithium cyclopropylacety
lide to an unprotected N-acylketimine. This reaction provides an efficient
route to the second generation NNRTI drug candidate DPC 963.