Pyrazolo[3,4-d]pyrimidinophanes: Convenient Synthesis of a New Class of Cyclophane and X-ray Structure of the First Representative
摘要:
A convenient synthesis of a new class of novel pyrazolo[3,4-d]pyrimidinophanes (four products, 41%), a new class of cyclophane, and X-ray structure of the first dissymmetrical [3,4]pyrazolo[3,4-d]pyrimidinophane (22%) are reported for the first time. The conformation of major syn product 6b is stabilized by weak pi-pi and O center dot center dot center dot Ar interactions.