3-phenyl-6-(m-tolylamino)pyrimidine-2,4(1H,3H)-dione 、
2-Hydroxymethylen-cholest-4-en-3-on 在
对甲苯磺酸 作用下,
以
二苯醚 为溶剂,
反应 0.75h,
以35%的产率得到(1R,3aS,3bS,13aR,13bS,15aR)-13a,15a-dimethyl-1-((R)-6-methylheptan-2-yl)-10-phenyl-7-(m-tolyl)-1,2,3,3a,3b,4,5,7,13,13a,13b,14,15,15a-tetradecahydro-9H-cyclopenta[5,6]naphtho[1,2-g]pyrimido[4,5-b]quinoline-9,11(10H)-dione