Synthesis of deuterium-labeled CB1 receptor antagonist 2-d9 was accomplished in three steps by alkylation of 2-nitrophenylacetonitrile with cyclopentyl-d9 bromide, reductive cyclization of the resulting secondary nitrile into the 3-cyclopentyl indole-d9 and its N-sulfonylation with corresponding p-amidosulfonyl chloride. Another, structurally related, CB1 receptor antagonist 1 was radiolabeled with carbon-14 by oxidative cleavage of 3-cyclopentyl indole followed by the ring closure of o-acyl substituted N-formylaniline with potassium cyanide-[14C], in situ reduction-elimination of the intermediate amino alcohol, and N-sulfonylation of the resulting 3-cyclopentyl indole-2-[14C].
合成重
氘标记的CB1受体拮抗剂2-d9通过三个步骤完成:首先用环戊基-d9
溴化物对2-硝基
苯乙腈进行烷基化,其次将生成的第二级腈还原环化为3-环戊基
吲哚-d9,最后用相应的对
氨基磺酰氯进行N-磺酰化。另一种结构相关的CB1受体拮抗剂1通过氧化断裂3-环戊基
吲哚,再用
氰化钾-[14C]对o-酰基取代的N-福尔马
氨基苯进行环闭合,同时进行中间
氨醇的原位还原-消除,以及对生成的3-环戊基
吲哚-2-[14C]进行N-磺酰化,进行了碳-14放射性标记。