[1]Tetrahedron,1996,vol.52,p.13017-13026
[2]Tetrahedron,2013,vol.69,p.3796-3804
[3]Patent:WO2020/25517,2020,A1.Locationinpatent:Paragraph00229;00249
[4]Patent:WO2004/31195,2004,A1.Locationinpatent:Page73-74
[1]Tetrahedron,1996,vol.52,p.13017-13026
[1]CurrentPatentAssignee:MERCK&COINC-WO2020/92667,2020,A1Locationinpatent:Page/Pagecolumn94