、 1-(diphenylmethyl)-3-hydroxy-3-(5-hydroxy-2-methyl-1,3-benzoxazol-6-yl)-1,3-dihydro-2H-indol-2-one 、
3-hydroxy-3-(5-hydroxy-2-methyl-1,3-benzothiazol-6-yl)-1,3-dihydro-2H-indol-2-one 以1-(diphenylmethyl)-3-(5-hydroxy-2-methyl-1,3-benzoxazol-6-yl)-1,3-dihydro-2H-indol-2-one was obtained (87%) as a colorless solid的产率得到1-(diphenylmethyl)-3-(5-hydroxy-2-methyl-1,3-benzoxazol-6-yl)-1,3-dihydro-2H-indol-2-one