Scheme 3.
Total Synthesis of (−)-Trigonoliimines A (1) and B (2).a
a Conditions: (a) NH2NH2•H2O, MeOH, 80 °C. (b) Martin Sulfurane, CH2Cl2, −78°C. (c) CH(OiPr)3, PPTS, CH2Cl2, 23 °C.
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