Concise asymmetric total syntheses of Strychnos alkaloids (−)-leuconicine A (14 steps, 9% overall yield) and B (13 steps, 10% overall yield) have been accomplished. Key steps include (1) our sequential one-pot spiro-cyclization/intramolecular aza-Baylis-Hillman method to prepare the ABCE framework; (2) a novel domino acylation/Knoevenagel cyclization to prepare the F-ring; and (3) a Heck cyclization
                                    的简洁不对称全合成马钱子( - ) -
生物碱leuconicine A(14个步骤,9%总产率)和B(13个步骤,10%总产率)已经完成。关键步骤包括:(1)我们连续的一锅螺旋环化/分子内氮杂-Baylis-Hillman方法来制备ABCE框架;(2)新颖的多米诺酰化/ Knoevenagel环化以制备F环;(3)Heck环化以访问D环。