An efficient route to the O-protected spirenones (2c) and (2d) is described: from these, the five known natural spirans of cannabis, i.e. cannabispiradienone (1a), cannabispirenone-A (2a), cannabispirenone-B (2b), cannabispirone (3a) and cannabispiranol (4a), are synthesised.
描述了通向O-保护的spirenones(2c)和(2d)的有效途径:从中,已知五个
大麻素的天然斯皮兰,即
大麻比拉
丁酮(1a),
大麻素-A(2a),
大麻素-B(2b),合成了
大麻素(3a)和
大麻素(4a)。