Patent ID: 8921554

Claim:
An azaborine having the formula wherein R 1 is hydrogen, deuterium, halogen, alkyl having 1-6 carbons, aryl having 1-carbons, heteroaryl having 1-6 carbons, acyl having 1-6 carbons, alkenyl having 1-6 carbons, alkynyl having 1-6 carbons, sulfonyl, —OR 7 , an amine protecting group, or Si(R 8 ) 3 , where each R 7 is independently hydrogen, alkyl having 1-6 carbons, acyl having 1-6 carbons, alkenyl having 1-6 carbons, tert-butyloxycarbonyl, or sulfonyl, and each R 8 is independently alkyl having 1-6 carbons, aryl having 1-6 carbons, alkoxy having 1-6 carbons, acyl having 1-6 carbons, alkenyl having 1-6 carbons, or tert-butyloxycarbonyl; R 5 is hydrogen, deuterium, halogen, alkyl having 1-6 carbons, acyl having 1-6 carbons, amide, alkenyl having 1-6 carbons, alkynyl having 1-6 carbons, —OR 7 , hydroxyl, —CN, —SR 7 , sulfonyl, aryl having 1-6 carbons, heteroaryl having 1-6 carbons, or a leaving group LG.