Reaction of 1,3-Disubstituted Acetone Derivatives with Pseudohalides: A Simple Approach to Spiro[4.4]nonane-Type Bis-Oxazolidines and -Imidazolidines (Bicyclic Carbamates, Thiocarbamates, Ureas, and Thioureas)
作者:Robert Saul、Thorsten Kern、Jürgen Kopf、István Pintér、Peter Köll
DOI:10.1002/(sici)1099-0690(200001)2000:1<205::aid-ejoc205>3.0.co;2-j
日期:2000.1
oxazoline-type spiro[4.4]nonanes upon reactions with potassium (thio)cyanate and cyanamide. In contrast, 1,3-diaminoacetone yields only the corresponding spiro-bisimidazolidinethione under similar conditions together with monocyclic by-products, but the spiro-bisimidazolidinone is accessible by reaction of 1,3-dichloroacetone with urea. The resolution of the racemic spiro-bisoxazolidinethione 2a was achieved
前手性 1,3-二羟基丙酮与(硫代)氰酸钾和氰胺反应后形成外消旋恶唑烷和恶唑啉型螺[4.4]壬烷。相比之下,1,3-二氨基丙酮在类似条件下仅产生相应的螺-双咪唑烷硫酮和单环副产物,但螺-双咪唑烷酮可通过 1,3-二氯丙酮与尿素的反应获得。外消旋螺二恶唑烷硫酮 2a 的拆分是通过使用马铃薯碱作为拆分剂实现的。