This compound can be obtained by two related ways (1,2): 1) The Grignard reaction of 2-amino-5-chlorobenzophenone (I) with methylmagnesium iodide in ether gives 2-amino-5-chloromethylbenzhydrol (II), which by reaction with ethyl isothiocyanate (III) in ether yields 2-(omega-ethylthioureido)-5-chloro-alpha-methylbenzhydrol (IV). Finally this compound is treated with mercuric oxide in refluxing ethanol. 2) The reaction of (II) with ethyl isocyanate (V) in ether gives 2-(omega-ethylureido)-5-chloro-alpha-methylbenzhydrol (VI), which is finally cyclized by treatment with aqueous 48% HBr at 100 C.

This compound can be obtained by two related ways (1,2): 1) The Grignard reaction of 2-amino-5-chlorobenzophenone (I) with methylmagnesium iodide in ether gives 2-amino-5-chloromethylbenzhydrol (II), which by reaction with ethyl isothiocyanate (III) in ether yields 2-(omega-ethylthioureido)-5-chloro-alpha-methylbenzhydrol (IV). Finally this compound is treated with mercuric oxide in refluxing ethanol. 2) The reaction of (II) with ethyl isocyanate (V) in ether gives 2-(omega-ethylureido)-5-chloro-alpha-methylbenzhydrol (VI), which is finally cyclized by treatment with aqueous 48% HBr at 100 C.

This compound can be obtained by two related ways (1,2): 1) The Grignard reaction of 2-amino-5-chlorobenzophenone (I) with methylmagnesium iodide in ether gives 2-amino-5-chloromethylbenzhydrol (II), which by reaction with ethyl isothiocyanate (III) in ether yields 2-(omega-ethylthioureido)-5-chloro-alpha-methylbenzhydrol (IV). Finally this compound is treated with mercuric oxide in refluxing ethanol. 2) The reaction of (II) with ethyl isocyanate (V) in ether gives 2-(omega-ethylureido)-5-chloro-alpha-methylbenzhydrol (VI), which is finally cyclized by treatment with aqueous 48% HBr at 100 C.