聚合甲醛 、
4-(5,5-二甲基-1,3,2-二氧杂己硼烷-2-基)苯甲醛 、
{(S)-2-[5-(tert-Butyl-dimethyl-silanyloxy)-2,4-dimethoxy-3-methyl-phenyl]-1-formyl-ethyl}-carbamic acid 9H-fluoren-9-ylmethyl ester 、
9H-fluoren-9-ylmethyl N-[(1S,2S)-3-[5-[tert-butyl(dimethyl)silyl]oxy-2,4-dimethoxy-3-methylphenyl]-1-cyano-1-[(2S)-2-(4-hydroxybutyl)morpholin-4-yl]propan-2-yl]carbamate 以58%的产率得到(1R,2S,10S,12R,13S)-10-[4-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)phenyl]-8,19-dihydroxy-5,7,16,18-tetramethoxy-6,17,21-trimethyl-11,21-diazapentacyclo[11.7.1.02,11.04,9.015,20]henicosa-4(9),5,7,15(20),16,18-hexaene-12-carbonitrile