摘要:
The synthesis of (+/-)-5-homoshikimic acid, its 5-fluoromethyl and difluoromethyl analogues are described from the cycloadducts of 5,6-dihydro-1-(t)butyloxycarbonylpyridine and methyl acrylate. The adducts on ring opening afford methyl 5-(t)butoxycarbonylmethyl-5,6-di-hydrobenzoate, which may be 3,4-cis-dihydroxylated and converted in a series of steps into the title compounds