The present invention relates to certain compounds of the formula (I), ##STR1## which are useful in the synthesis of certain .beta.-adrenergic receptor agonists. The invention also relates to a process for synthesizing the compounds of formula (I) and to compounds of the formula (II), ##STR2## wherein R.sup.1, R.sup.2 and R.sup.4 are defined herein, which are useful in the synthesis of the compounds of formula (I). The invention also relates to a process for synthesizing a compound of formula (II). The invention further relates to processes for synthesizing compounds of formula (Z*), ##STR3## R.sup.1, R.sup.2 and Y.sup.2* are defined herein.
本发明涉及公式(I)的某些化合物,##STR1##它们在合成某些β-
肾上腺素受体激动剂方面是有用的。本发明还涉及合成公式(I)的化合物的过程,以及公式(II)的化合物,##STR2##其中R.sup.1,R.sup.2和R.sup.4在此定义,它们在合成公式(I)的化合物方面是有用的。本发明还涉及合成公式(II)的化合物的过程。本发明还涉及合成公式(Z*)的化合物的过程,##STR3##其中R.sup.1,R.sup.2和Y.sup.2*在此定义。