由环丁酮和氯甲基对甲苯基亚砜合成的[氯(对甲苯甲硫基)亚甲基]环丁烷可分三步以高总收率进行处理,过量的氰基甲基锂则可以高产率得到烯腈。用乙酸中的H 3 PO 4加热这些烯腈,得到高产率的2-氰基双环[3.3.0] oct-1-en-3-one。另一方面,用氰基甲基锂处理[氯(对甲苯基亚磺酰基)亚甲基]环丁烷,然后将乙腈同系物的碳负离子锂化,得到在3-位具有取代基的烯氨基腈。用H 3 PO 4加热烯腈在乙酸中的乙酸得到高至高产率的2-取代的双环[3.3.0] oct-1-en-3-one。该方法提供了一种新颖且通用的方法,可从环丁酮以良好的总收率合成2-取代的双环[3.3.0] oct-1-en-3-ones。
substituent at the 3-position. Heating of the enaminonitriles with H3PO4 in acetic acid gave 2-substituted bicyclo[3.3.0]oct-1-en-3-ones in good to high yields. This method offers a novel and versatile procedure for synthesis of 2-substituted bicyclo[3.3.0]oct-1-en-3-ones from cyclobutanones in good overall yields.
由环丁酮和氯甲基对甲苯基亚砜合成的[氯(对甲苯甲硫基)亚甲基]环丁烷可分三步以高总收率进行处理,过量的氰基甲基锂则可以高产率得到烯腈。用乙酸中的H 3 PO 4加热这些烯腈,得到高产率的2-氰基双环[3.3.0] oct-1-en-3-one。另一方面,用氰基甲基锂处理[氯(对甲苯基亚磺酰基)亚甲基]环丁烷,然后将乙腈同系物的碳负离子锂化,得到在3-位具有取代基的烯氨基腈。用H 3 PO 4加热烯腈在乙酸中的乙酸得到高至高产率的2-取代的双环[3.3.0] oct-1-en-3-one。该方法提供了一种新颖且通用的方法,可从环丁酮以良好的总收率合成2-取代的双环[3.3.0] oct-1-en-3-ones。
A method for synthesis of bicyclo[3.3.0]oct-1-en-3-ones from cyclobutanones with one-carbon ring expansion and its application to a formal synthesis of racemic 1-desoxyhypnophilin
method for synthesis of 2-cyanobicyclo[3.3.0]oct-1-en-3-ones and 2-substituted bicyclo[3.3.0]oct-1-en-3-ones was developed by assembly of three components, cyclobutanones, chloromethyl p-tolyl sulfoxide, and nitriles, with one-carbon ring expansion of the cyclobutane ring. As an application of this method, a formal synthesis of 1-desoxyhypnophilin in racemic form was performed starting from 3,3-di(p