9-[(3R)-6-formyl-1-oxo-8-phenylmethoxy-3-propyl-3,4-dihydroisochromen-7-yl]-7-methoxy-10-phenylmethoxy-11H-[1,3]dioxolo[4,5-a]xanthene-8-carbaldehyde 在
samarium diiodide 、 (R,R)-iPr-PYBOX 、
air 作用下,
以
四氢呋喃 为溶剂,
反应 0.53h,
以75%的产率得到(18S,19S,24R)-18,19-dihydroxy-16-methoxy-2,28-bis(phenylmethoxy)-24-propyl-7,9,14,25-tetraoxaheptacyclo[15.12.0.03,15.05,13.06,10.020,29.022,27]nonacosa-1,3(15),5(13),6(10),11,16,20(29),21,27-nonaen-26-one