Ref. No. 41/1086
In the name of Allah the most Gracious the most merciful
The answer to your question is as follows:
It is Wajib (necessary) to proceed for Juma prayer after first Azan is called. Therefore, sleeping or doing any transaction that interferes in the process will not be permissible. Allah says in the holy Quran: O ye who believe! When the call is proclaimed to prayer on Friday, hasten earnestly to the remembrance of Allah, and leave off business; that is best for you if ye but knew! (The Quran, 62/9).
So, it is necessary on the first Azan (which is recited when the sun begins to decline) to leave off business and hasten to Friday prayer.
(قوله ويجب السعي وترك البيع بالأذان الأول) لقوله تعالى {يا أيها الذين آمنوا إذا نودي للصلاة من يوم الجمعة فاسعوا إلى ذكر الله وذروا البيع} [الجمعة: 9] (البحرالرائق ۲/۱٦٨)
And Allah knows best
Darul Ifta
Darul Uloom Waqf deoband