2,2-DImethyl-1-(7-methyl-6-((trimethylsilyl)ethynyl)-2,3-dihydro-1h-pyrido[2,3-b][1,4]oxazin-1-yl)propan-1-one 1g

2,2-DImethyl-1-(7-methyl-6-((trimethylsilyl)ethynyl)-2,3-dihydro-1h-pyrido[2,3-b][1,4]oxazin-1-yl)propan-1-one 1g