Abstract  Description  Claims  Drawing  Cited references 

US20010056090A   [0004] 
US20100105917A   [0006] 
JP2011012032A   [0008] 
WO2007075630A   [0009] 
US5220016A   [0048] 
WO0056730A   [0048] 
EP1341762A   [0048] 
US6340762B   [0048] 
WO02068391A   [0049] 
WO9732644A   [0117] 

Tetrahedron Letters   [0005] 
Tetrahedron Asymmetry   [0008]