2-Isopropyl-3,6-dimethoxy-5 -phenyl-2,5 dihydropyrazine

The same substrate (64) gave the complex (67) (BuLi, THF, -78°C then PhMn (CO)3.BF4 J, -78°C, 30 min 80%), and thence, by oxidative demetalation, 2-isopropyl-3,6-dimethoxy-5-phenyl-2,5-dihydropyrazine (68) [/V-bromosuc-cinimide (NBS), Et20, 20°C, 15 min 60%) also substituted-phenyl analogues likewise.169... 

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See also in sourсe #XX -- [ ]

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