[(1R,2R,4aS,5R,7R,8S,8aS)-5-Hydroxy-8-(2-hydroxy-ethyl)-2,7,8a-trimethyl-3-oxo-1-(2-oxo-propyl)-decahydro-naphthalen-2-yl]-acetaldehyde 在
对甲苯磺酸 作用下,
以
苯 为溶剂,
反应 2.0h,
以61%的产率得到rac-(5aR,5a1R,6S,8S,8aR,11S,11aR,Z)-8-hydroxy-2,5a1,6,11-tetramethyl-4,5,5a,6,7,8,8a,9,11,11a-decahydro-1,11-ethenonaphtho[1,8-de]oxocin-10(5a1H)-one